Joslyn is a distinctive girls' name in United States, ranking #798 in 2002 with 294 recorded births. The name reached its all-time peak in 2010 with 461 births ranking #641. Since 1996, the popularity has increased by 51.5%. In 2002, approximately 1 in every 6,112 girls born was named Joslyn. FALLING Recent data shows the name is currently falling.